Fire resistance tests -- Elements of building construction -- Requirements for active fire curtains

This document specifies requirements for the design, testing and classification of active fire curtains, applicable to any material, that are designed to provide fire and smoke resistance. This document gives recommendations for the application, installation and maintenance of active fire curtains. It is also intended to provide guidance and recommendations for designers, specifiers (e.g. architects, fire engineers), authorities having jurisdiction (AHJs), installers and maintainers for the following: a) creating compartmentation; b) creating protected routes for the purpose of means of escape; c) providing protection at the location of non-fire resisting elements (e.g. in front of non-fire-resisting glazing and doorsets) where required for compartmentation or protecting means of escape; d) providing fire- and smoke-resistant active fire curtains in conjunction with non-smoke rated products protecting openings to reduce leakage of smoke. This document does not apply to the following, which are intended for a different use: —   barriers made of part of the building’s structure; —   theatre/proscenium textile curtains; —   smoke barriers according to ISO 21927-1; —   door and shutter assemblies according to ISO 3008‑1. NOTE 1   Smoke barriers used solely for smoke control are covered by ISO 21927‑1. Such smoke barriers are not considered to be active fire curtains. NOTE 2   Requirements of fire doors are given in ISO 3008-1. Requirements for leakage are given in ISO 5925‑1 and further information is given in ISO/TR 5925‑2.

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Status
Published
Publication Date
04-Jul-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
28-May-2021
Completion Date
28-May-2021
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INTERNATIONAL ISO
STANDARD 21524
First edition
2021-07
Fire resistance tests — Elements
of building construction —
Requirements for active fire curtains
Reference number
ISO 21524:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 21524:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21524:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols .......................................................................................................................................................................................................................... 4

5 Requirements .......................................................................................................................................................................................................... 5

5.1 General ........................................................................................................................................................................................................... 5

5.2 Side retention ........................................................................................................................................................................................... 6

5.3 Additional requirements for multiple active fire curtains ................................................................................ 7

5.3.1 Multiple active fire curtains ................................................................................................................................... 7

5.3.2 Required overlap ............................................................................................................................................................. 9

5.3.3 Larger than tested ...................................................................... ..................................................................................... 9

5.4 Horizontal or angled .......................................................................................................................................................................... 9

5.5 Pass door(s) ............................................................................................................................................................................................11

5.6 Vision panels ..........................................................................................................................................................................................12

6 Sampling .....................................................................................................................................................................................................................13

6.1 Test samples, testing and conformance criteria ......................................................................................................13

7 Test methods ..........................................................................................................................................................................................................14

7.1 General ........................................................................................................................................................................................................14

7.2 Durability and force gauge .........................................................................................................................................................15

7.3 Reliability and durability.............................................................................................................................................................15

7.4 Deployment .............................................................................................................................................................................................15

7.4.1 Response time and velocity .................................................................................................................................15

7.4.2 Delayed and/or multi-positional deployment ....................................................................................16

7.4.3 Emergency egress control ....................................................................................................................................16

7.4.4 Emergency access control .................. ...................................................................................................................16

7.5 Smoke leakage ......................................................................................................................................................................................16

7.5.1 General...................................................................................................................................................................................16

7.5.2 Total smoke leakage of active fire curtains with smoke-resistance ..................................16

7.6 Fire resistance ......................................................................................................................................................................................16

7.6.1 General...................................................................................................................................................................................16

7.6.2 Integrity ................................................................................................................................................................................17

7.6.3 Insulation ............................................................................................................................................................................17

7.6.4 Radiation (heat flux) ..................................................................................................................................................17

7.6.5 Deflection zone ...............................................................................................................................................................18

7.6.6 Initial deployment .......................................................................................................................................................18

7.6.7 Operation following initial deployment — emergency egress .............................................18

7.6.8 Operation following initial deployment — emergency access..............................................18

7.6.9 Delayed and/or multi-positional deployment ....................................................................................18

7.7 Reaction to fire .....................................................................................................................................................................................18

7.8 Ancillary devices.................................................................................................................................................................................19

7.8.1 General...................................................................................................................................................................................19

7.8.2 Ancillary devices activation .................................................................................................................................19

7.8.3 Hold-open devices .......................................................................................................................................................19

7.8.4 Fire detection and alarm systems ..................................................................................................................19

7.8.5 Sensory equipment for obstruction warning .......................................................................................19

7.8.6 Pressure-sensitive protective equipment (PSPE).............................................................................19

7.8.7 Self-test facility for dwellings .............................................................................................................................19

8 Marking, labelling and packaging ...................................................................................................................................................20

Annex A (normative) General requirements for testing ...............................................................................................................21

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 21524:2021(E)

Annex B (normative) Order of testing ..............................................................................................................................................................24

Annex C (normative) Fire-resistance test method ..............................................................................................................................26

Annex D (normative) Overlapping multiple active fire curtains ..........................................................................................41

Annex E (normative) Test method for active fire curtains reliability and response time and

the durability of materials ......................................................................................................................................................................43

Annex F (normative) Test method for reliability of motor operation at elevated temperatures .......46

Annex G (normative) Calculation of ambient temperature smoke leakage .............................................................52

Annex H (normative) Test method for the durability and reliability of alternative or

additional motors .............................................................................................................................................................................................55

Annex I (normative) Test method for ancillary and optional equipment ...................................................................58

Annex J (normative) Test method for durability and force gauge ......................................................................................62

Annex K (informative) Typical product performance summary ..........................................................................................65

Annex L (normative) System design ...................................................................................................................................................................67

Annex M (informative) Installation.....................................................................................................................................................................79

Annex N (informative) Commissioning ...........................................................................................................................................................83

Annex O (informative) Inspection, testing and maintenance ..................................................................................................86

Annex P (informative) Typical approving authority pre-installation checklist ...................................................88

Annex Q (informative) An engineered approach to using radiative heat flux for tenable

conditions for single-level horizontal routes ......................................................................................................................89

Annex R (informative) Yarns and fabric materials .............................................................................................................................99

Annex S (informative) Typical installation checklist ....................................................................................................................100

Annex T (informative) Model installation certificate ...................................................................................................................103

Annex U (informative) Typical inspection checklist .....................................................................................................................105

Annex V (informative) Model commissioning certificate.........................................................................................................107

Annex W (informative) Model completion certificate .................................................................................................................109

Annex X (informative) Model servicing certificate .........................................................................................................................111

Bibliography .........................................................................................................................................................................................................................113

iv © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21524:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 2, Fire

containment.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 21524:2021(E)
Introduction

As fire-separating elements, active fire curtains are intended to provide two main functions:

a) to maintain any compartmentation of buildings needed to limit the spread of fire and smoke; and

b) to allow access to protected escape routes, both vertical and horizontal, without any loss of fire

resistance, and to limit smoke entry into these routes, i.e. protected corridors and protected shafts.

They can also be partially deployed to control the deployment of fire effluent within buildings in the

event of fire, prior to being fully deployed as active fire curtains.

Recommended positions and ratings for fire-separating elements for means of escape purposes are

given in national codes providing either prescriptive or risk-based approaches using the principles of

fire safety engineering.

When used as part of a fire-engineered design solution, active fire curtains can become a critical

element of design. If active fire curtains do not deploy to their operational position, the fire-engineered

design solution is compromised. However, in the event that other fire protection systems or elements

do not function (e.g. due to total power failure), active fire curtains in their fire-operational position

provide fire separation.

Active fire curtains used in life safety and property protection applications can be vertical, horizontal

or angled. Depending on the application, they are at times used to replace fire doors, roller shutters,

non-loadbearing walls, non-loadbearing ceilings, glazed elements, etc. At times, they are also used to

form fire separation, e.g. forming protected routes or lobbies. They provide some of the functionalities

of a fire door, but when used only for fire and smoke leakage, as a fire door, then different requirements

apply. These requirements are given in ISO 3008-1 and ISO 5925-1, and further information is given in

ISO/TR 5925-2. Active fire curtains enable greater widths and deployments using less space than other

traditional methods.

It is essential that any proposed use of active fire curtains be assessed in the context of the building

use and perceived occupancy to ensure that it is ultimately suitable and fit for purpose, taking into

consideration such factors as:
a) fire resistance;
b) reaction to fire;
c) smoke leakage;
d) occupancy type and risk profile;
e) occupancy load;
f) means of escape for egress;
g) ingress for fire and rescue service;
h) life safety and property protection objectives.
Some examples of how active fire curtains are deployed are:
a) deploy fully upon receipt of a signal from the fire alarm system;

b) remain retracted when the fire alarm system is activated and only deploy upon receipt of a signal

from a local smoke/heat detector. In these circumstances, the only active fire curtains to deploy

are those where fire or smoke are in the vicinity;

c) remain retracted when the fire alarm system is activated for a predetermined time to allow for

evacuation before deploying fully;
vi © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 21524:2021(E)

d) for vertical installations, move to a given height above finished floor level when the fire alarm

system is activated to contain smoke for a predetermined time before closing fully for fire

separation;

e) for vertical installations, move to a given height above finished floor level when a specific fire alarm

system signal is provided to contain smoke when the fire location is such that active fire curtains

are not required to deploy fully;
f) deploy upon loss of primary and auxiliary power supply.

In fire safety situations, it is often important to establish the heat transfer from one side of the

separating element to the other in order to calculate escape route sizes and safe operating distances.

Traditionally this has been established using insulation and radiation measurements.

NOTE National codes apply to life safety. Higher performance levels are sometimes necessary for certain

applications if property protection is required.
© ISO 2021 – All rights reserved vii
---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO 21524:2021(E)
Fire resistance tests — Elements of building construction
— Requirements for active fire curtains
1 Scope

This document specifies requirements for the design, testing and classification of active fire curtains,

applicable to any material, that are designed to provide fire and smoke resistance.

This document gives recommendations for the application, installation and maintenance of active fire

curtains. It is also intended to provide guidance and recommendations for designers, specifiers (e.g.

architects, fire engineers), authorities having jurisdiction (AHJs), installers and maintainers for the

following:
a) creating compartmentation;
b) creating protected routes for the purpose of means of escape;

c) providing protection at the location of non-fire resisting elements (e.g. in front of non-fire-resisting

glazing and doorsets) where required for compartmentation or protecting means of escape;

d) providing fire- and smoke-resistant active fire curtains in conjunction with non-smoke rated

products protecting openings to reduce leakage of smoke.

This document does not apply to the following, which are intended for a different use:

— barriers made of part of the building’s structure;
— theatre/proscenium textile curtains;
— smoke barriers according to ISO 21927-1;
— door and shutter assemblies according to ISO 3008-1.

NOTE 1 Smoke barriers used solely for smoke control are covered by ISO 21927-1. Such smoke barriers are not

considered to be active fire curtains.

NOTE 2 Requirements of fire doors are given in ISO 3008-1. Requirements for leakage are given in ISO 5925-1

and further information is given in ISO/TR 5925-2.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 834-1, Fire-resistance tests — Elements of building construction — Part 1: General requirements

ISO 1182, Reaction to fire tests for products — Non-combustibility test

ISO 1716, Reaction to fire tests for products — Determination of the gross heat of combustion (calorific

value)

ISO 3009, Fire-resistance tests — Elements of building construction — Glazed elements

ISO 5925-1, Fire tests — Smoke-control door and shutter assemblies — Part 1: Ambient- and medium-

temperature leakage tests
© ISO 2021 – All rights reserved 1
---------------------- Page: 8 ----------------------
ISO 21524:2021(E)

ISO 9705-1, Reaction to fire tests — Room corner test for wall and ceiling lining products — Part 1: Test

method for a small room configuration

ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame —

Part 2: Single-flame source test
ISO 13943, Fire safety — Vocabulary

ISO 21927-10, Smoke and heat control systems — Part 10: Specification for power output devices

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 834-1 and ISO 13943 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
active fire curtain

curtain, manufactured from flexible materials, not hinged or pivoted, provided for the passage of

persons, air and objects, which, together with its frame as installed in a building, is intended (when

closed) to resist the passage of fire
3.2
compartmentation

process of separating a building or part of a building into one or more rooms, spaces or storeys, with

the intention of preventing the spread of fire to or from another part of the same building or adjoining

building

Note 1 to entry: Compartmentation is mainly implemented to assist the fire and rescue services by confining

the fire within a fire-resisting enclosure. In some instances, it is employed to assist means of escape in buildings

where evacuation might be delayed (e.g. where phased evacuation policy has been applied in premises such as

hospitals and care homes) or where a policy of non-evacuation (e.g. “defend in place” or “stay put strategy”) is

employed, as in blocks of flats.

Note 2 to entry: Fire enclosures specifically for the purpose of means of escape, such as lobby protection to

stairways and enclosure of special risks, are not regarded as compartments and may employ passive smoke

separation measures.
3.3
competent person

individual suitably trained and qualified by knowledge and practical experience and provided with the

necessary instructions to enable the required task(s) to be carried out correctly

3.4
deployment

movement of an active fire curtain from its retracted position to its fire-operational position

3.5
dwelling

unit of residential accommodation occupied (whether or not as a sole or main residence):

a) by a single person or by people living together as a family; or

b) by not more than six residents living together as a single household, including a household where

care is provided for residents
2 © ISO 2021 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 21524:2021(E)
3.6
fire effluent

all gases and aerosols, including suspended particles, created by combustion or pyrolysis and emitted

to the environment
[SOURCE: ISO 26367-1:2019, 3.6, modified — Notes to entry removed.]
3.7
fire-operational position

final configuration of an active fire curtain specified by its designer to achieve and be sustained in the

ultimate fire condition of the design
3.8
fire separation

method of providing an element that is intended for use in maintaining separation between two adjacent

areas of a building in the event of a fire to form protected routes and/or compartmentation

3.9
fire strategy

safety design for a particular building determined by prescriptive codes, fire safety engineering or fire

risk assessment
3.10
fit for purpose

ability of a product, process or service to serve a defined purpose under specific conditions

3.11
gravity fail safe

ability of an active fire curtain to move to its fire-operational position in a safe and controlled manner

to facilitate fire separation when all consumable primary and auxiliary power supplies are removed, in

the event of wiring or system corruption, open or short circuit, or any combination thereof

3.12
integrity

ability of a separating element, when exposed to fire on one side, to prevent the passage of flames and

hot gases or occurrence of flames on the unexposed side, for a stated period of time in a standard fire

resistance test
[SOURCE: ISO 22899-1:2007, 3.9]
3.13
hold-open device

element of the hold-open system that allows a gravity fail safe active fire curtain to remain open either

at a pre-set or chosen position until released
3.14
life safety

application of the active fire curtain in its fire-operational position assisting in the protection of the

means of escape and access for the fire and rescue service
3.15
material
fabric
product made from fibres

Note 1 to entry: Within the context of this document, "material" is understood to conform to one of the following

tests:
Note 2 to entry: a) Non-combustible test (ISO 1182).
Note 3 to entry: b) Limited combustibility test (ISO 1716).
© ISO 2021 – All rights reserved 3
---------------------- Page: 10 ----------------------
ISO 21524:2021(E)

Note 4 to entry: Within the context of this document, "material" is understood to require the following tests:

Note 5 to entry: a) Room corner test for wall and ceiling linings (ISO/TR 9705-2).

Note 6 to entry: b) Ignitability of products when subjected to direct impingement of flame test (ISO 11925-2).

3.16
means of escape

means whereby a safe route (or routes) in the event of fire is (or are) provided for persons to travel from

any point in a building to a place of ultimate safety
3.17
multi-positional deployment

staged deployment of active fire curtain to provide initial smoke separation prior to full fire separation

3.18
property protection

application of the active fire curtain in its fire-operational condition to protect a building’s contents

and structure
3.19
side retention
retention device which links the active fire curtain fabri
...

INTERNATIONAL ISO
STANDARD 21524
First edition
Fire resistance tests — Elements
of building construction —
Requirements for active fire curtains
PROOF/ÉPREUVE
Reference number
ISO 21524:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 21524:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21524:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols .......................................................................................................................................................................................................................... 4

5 Requirements .......................................................................................................................................................................................................... 5

5.1 General ........................................................................................................................................................................................................... 5

5.2 Side retention ........................................................................................................................................................................................... 6

5.3 Additional requirements for multiple active fire curtains ................................................................................ 6

5.3.1 Multiple active fire curtains ................................................................................................................................... 6

5.3.2 Required overlap ............................................................................................................................................................. 8

5.3.3 Larger than tested ...................................................................... ..................................................................................... 8

5.4 Horizontal or angled .......................................................................................................................................................................... 8

5.5 Pass door(s) ............................................................................................................................................................................................10

5.6 Vision panels ..........................................................................................................................................................................................11

6 Sampling .....................................................................................................................................................................................................................12

6.1 Test samples, testing and conformance criteria ......................................................................................................12

7 Test methods ..........................................................................................................................................................................................................13

7.1 General ........................................................................................................................................................................................................13

7.2 Durability and force gauge .........................................................................................................................................................14

7.3 Reliability and durability.............................................................................................................................................................14

7.4 Deployment .............................................................................................................................................................................................14

7.4.1 Response time and velocity .................................................................................................................................14

7.4.2 Delayed and/or multi-positional deployment ....................................................................................15

7.4.3 Emergency egress control ....................................................................................................................................15

7.4.4 Emergency access control .................. ...................................................................................................................15

7.5 Smoke leakage ......................................................................................................................................................................................15

7.5.1 General...................................................................................................................................................................................15

7.5.2 Total smoke leakage of active fire curtains with smoke-resistance ..................................15

7.6 Fire resistance ......................................................................................................................................................................................16

7.6.1 General...................................................................................................................................................................................16

7.6.2 Integrity ................................................................................................................................................................................16

7.6.3 Insulation ............................................................................................................................................................................16

7.6.4 Radiation (heat flux) ..................................................................................................................................................16

7.6.5 Deflection zone ...............................................................................................................................................................17

7.6.6 Initial deployment .......................................................................................................................................................17

7.6.7 Operation following initial deployment — emergency egress .............................................17

7.6.8 Operation following initial deployment — emergency access..............................................17

7.6.9 Delayed and/or multi-positional deployment ....................................................................................17

7.7 Reaction to fire .....................................................................................................................................................................................17

7.8 Ancillary devices.................................................................................................................................................................................18

7.8.1 General...................................................................................................................................................................................18

7.8.2 Ancillary devices activation .................................................................................................................................18

7.8.3 Hold-open devices .......................................................................................................................................................18

7.8.4 Fire detection and alarm systems ..................................................................................................................18

7.8.5 Sensory equipment for obstruction warning .......................................................................................18

7.8.6 Pressure-sensitive protective equipment (PSPE).............................................................................18

7.8.7 Self-test facility for dwellings .............................................................................................................................18

8 Marking, labelling and packaging ...................................................................................................................................................19

Annex A (normative) General requirements for testing ...............................................................................................................20

© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 21524:2021(E)

Annex B (normative) Order of testing ..............................................................................................................................................................23

Annex C (normative) Fire-resistance test method ..............................................................................................................................25

Annex D (normative) Overlapping multiple active fire curtains ..........................................................................................40

Annex E (normative) Test method for active fire curtains reliability and response time and

the durability of materials ......................................................................................................................................................................42

Annex F (normative) Test method for reliability of motor operation at elevated temperatures .......45

Annex G (normative) Calculation of ambient temperature smoke leakage .............................................................51

Annex H (normative) Test method for the durability and reliability of alternative or

additional motors .............................................................................................................................................................................................54

Annex I (normative) Test method for ancillary and optional equipment ...................................................................57

Annex J (normative) Test method for durability and force gauge ......................................................................................61

Annex K (informative) Typical product performance summary ..........................................................................................64

Annex L (normative) System design ...................................................................................................................................................................66

Annex M (informative) Installation.....................................................................................................................................................................78

Annex N (informative) Commissioning ...........................................................................................................................................................82

Annex O (informative) Inspection, testing and maintenance ..................................................................................................85

Annex P (informative) Typical approving authority pre-installation checklist ...................................................87

Annex Q (informative) An engineered approach to using radiative heat flux for tenable

conditions for single-level horizontal routes ......................................................................................................................88

Annex R (informative) Yarns and fabric materials .............................................................................................................................99

Annex S (informative) Typical installation checklist ....................................................................................................................100

Annex T (informative) Model installation certificate ...................................................................................................................103

Annex U (informative) Typical inspection checklist .....................................................................................................................105

Annex V (informative) Model commissioning certificate.........................................................................................................107

Annex W (informative) Model completion certificate .................................................................................................................109

Annex X (informative) Model servicing certificate .........................................................................................................................111

Bibliography .........................................................................................................................................................................................................................113

iv PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21524:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 2, Fire

containment.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE v
---------------------- Page: 5 ----------------------
ISO 21524:2021(E)
Introduction

As fire-separating elements, active fire curtains are intended to provide two main functions:

a) to maintain any compartmentation of buildings needed to limit the spread of fire and smoke; and

b) to allow access to protected escape routes, both vertical and horizontal, without any loss of fire

resistance, and to limit smoke entry into these routes, i.e. protected corridors and protected shafts.

They can also be partially deployed to control the deployment of fire effluent within buildings in the

event of fire, prior to being fully deployed as active fire curtains.

Recommended positions and ratings for fire-separating elements for means of escape purposes are

given in national codes providing either prescriptive or risk-based approaches using the principles of

fire safety engineering.

When used as part of a fire-engineered design solution, active fire curtains can become a critical

element of design. If active fire curtains do not deploy to their operational position, the fire-engineered

design solution is compromised. However, in the event that other fire protection systems or elements

do not function (e.g. due to total power failure), active fire curtains in their fire-operational position

provide fire separation.

Active fire curtains used in life safety and property protection applications can be vertical, horizontal

or angled. Depending on the application, they are at times used to replace fire doors, roller shutters,

non-loadbearing walls, non-load-bearing ceilings, glazed elements, etc. At times, they are also used to

form fire separation, e.g. forming protected routes or lobbies. They provide some of the functionalities

of a fire door, but when used only for fire and smoke leakage, as a fire door, then different requirements

apply. These requirements are given in ISO 3008-1 and ISO 5925-1, and further information is given in

ISO/TR 5925-2. Active fire curtains enable greater widths and deployments using less space than other

traditional methods.

It is essential that any proposed use of active fire curtains be assessed in the context of the building

use and perceived occupancy to ensure that it is ultimately suitable and fit for purpose, taking into

consideration such factors as:
a) fire resistance;
b) reaction to fire;
c) smoke leakage;
d) occupancy type and risk profile;
e) occupancy load;
f) means of escape for egress;
g) ingress for fire and rescue service;
h) life safety and property protection objectives.
Some examples of how active fire curtains are deployed are:
a) deploy fully upon receipt of a signal from the fire alarm system;

b) remain retracted when the fire alarm system is activated and only deploy upon receipt of a signal

from a local smoke/heat detector. In these circumstances, the only active fire curtains to deploy

are those where fire or smoke are in the vicinity;

c) remain retracted when the fire alarm system is activated for a predetermined time to allow for

evacuation before deploying fully;
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ISO 21524:2021(E)

d) for vertical installations, move to a given height above finished floor level when the fire alarm

system is activated to contain smoke for a predetermined time before closing fully for fire

separation;

e) for vertical installations, move to a given height above finished floor level when a specific fire alarm

system signal is provided to contain smoke when the fire location is such that active fire curtains

are not required to deploy fully;
f) deploy upon loss of primary and auxiliary power supply.

In fire safety situations, it is often important to establish the heat transfer from one side of the

separating element to the other in order to calculate escape route sizes and safe operating distances.

Traditionally this has been established using insulation and radiation measurements.

NOTE National codes apply to life safety. Higher performance levels are sometimes necessary for certain

applications if property protection is required.
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INTERNATIONAL STANDARD ISO 21524:2021(E)
Fire resistance tests — Elements of building construction
— Requirements for active fire curtains
1 Scope

This document specifies requirements for the design, testing and classification of active fire curtains,

applicable to any material, that are designed to provide fire and smoke resistance.

This document gives recommendations for the application, installation and maintenance of active fire

curtains. It is also intended to provide guidance and recommendations for designers, specifiers (e.g.

architects, fire engineers), Authorities Having Jurisdiction (AHJs), installers and maintainers for the

following:
a) creating compartmentation;
b) creating protected routes for the purpose of means of escape;

c) providing protection at the location of non-fire resisting elements (e.g. in front of non-fire-resisting

glazing and doorsets) where required for compartmentation or protecting means of escape;

d) providing fire- and smoke-resistant active fire curtains in conjunction with non-smoke rated

products protecting openings to reduce leakage of smoke.

This document does not apply to the following, which are intended for a different use:

— barriers made of part of the building’s structure;
— theatre/proscenium textile curtains;
— smoke barriers according to ISO 21927-1;
— doorsets or operable fabric curtains according to ISO 3008-1.

NOTE 1 Smoke barriers, used solely for smoke control, are covered by ISO 21927-1. Such smoke barriers are

not considered to be active fire curtains.

NOTE 2 Requirements of fire doors are given in ISO 3008-1. Requirements for leakage are given in ISO 5925-1

and further information is given in ISO/TR 5925-2.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 834-1, Fire-resistance tests — Elements of building construction — Part 1: General requirements

ISO 1182, Reaction to fire tests for products — Non-combustibility test

ISO 1716, Reaction to fire tests for products — Determination of the gross heat of combustion (calorific

value)

ISO 3009, Fire-resistance tests — Elements of building construction — Glazed elements

ISO 5925-1, Fire tests — Smoke-control door and shutter assemblies — Part 1: Ambient- and medium-

temperature leakage tests
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ISO 21524:2021(E)

ISO 9705-1, Reaction to fire tests — Room corner test for wall and ceiling lining products — Part 1: Test

method for a small room configuration

ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame —

Part 2: Single-flame source test
ISO 13943, Fire safety — Vocabulary

ISO 21927-10, Smoke and heat control systems — Part 10: Specification for power output devices

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 834-1 and ISO 13943 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
active fire curtain

curtain, manufactured from flexible materials, not hinged or pivoted, provided for the passage of

persons, air and objects, which, together with its frame as installed in a building, is intended (when

closed) to resist the passage of fire
3.2
compartmentation

process of separating a building or part of a building into one or more rooms, spaces or storeys, with

the intention of preventing the spread of fire to or from another part of the same building or adjoining

building

Note 1 to entry: Compartmentation is mainly implemented to assist the fire and rescue services by confining

the fire within a fire-resisting enclosure. In some instances, it is employed to assist means of escape in buildings

where evacuation might be delayed (e.g. where phased evacuation policy has been applied in premises such as

hospitals and care homes) or where a policy of non-evacuation (e.g. “defend in place” or “stay put strategy”) is

employed, as in blocks of flats.

Note 2 to entry: Fire enclosures specifically for the purpose of means of escape, such as lobby protection to

stairways and enclosure of special risks, are not regarded as compartments and may employ passive smoke

separation measures.
3.3
competent person

individual suitably trained and qualified by knowledge and practical experience and provided with the

necessary instructions to enable the required task(s) to be carried out correctly

3.4
deployment

movement of an active fire curtain from its retracted position to its fire-operational position

3.5
dwelling

unit of residential accommodation occupied (whether or not as a sole or main residence):

a) by a single person or by people living together as a family; or

b) by not more than six residents living together as a single household, including a household where

care is provided for residents
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ISO 21524:2021(E)
3.6
fire effluent

all gases and aerosols, including suspended particles, created by combustion or pyrolysis and emitted

to the environment
[SOURCE: ISO 26367-1:2019, 3.6, modified — Notes to entry removed.]
3.7
fire-operational position

final configuration of an active fire curtain specified by its designer to achieve and be sustained in the

ultimate fire condition of the design
3.8
fire separation

method of providing an element that is intended for use in maintaining separation between two adjacent

areas of a building in the event of a fire to form protected routes and/or compartmentation

3.9
fire strategy

safety design for a particular building determined by prescriptive codes, fire safety engineering or fire

risk assessment
3.10
fit for purpose

ability of a product, process or service to serve a defined purpose under specific conditions

3.11
gravity fail safe

ability of an active fire curtain to move to its fire-operational position in a safe and controlled manner

to facilitate fire separation when all consumable primary and auxiliary power supplies are removed, in

the event of wiring or system corruption, open or short circuit, or any combination thereof

3.12
integrity

ability of a separating element, when exposed to fire on one side, to prevent the passage of flames and

hot gases or occurrence of flames on the unexposed side, for a stated period of time in a standard fire

resistance test
[SOURCE: ISO 22899-1:2007, 3.9]
3.13
hold-open device

element of the hold-open system that allows a gravity fail safe active fire curtain to remain open either

at a pre-set or chosen position until released
3.14
life safety

application of the active fire curtain in its fire-operational position assisting in the protection of the

means of escape and access for the fire and rescue service
3.15
material
fabric
product made from fibres

Note 1 to entry: Within the context of this document, "material" is understood to conform to one of the following

tests:
Note 2 to entry: a) Non-combustible test (ISO 1182).
Note 3 to entry: b) Limited combustibility test (ISO 1716).
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ISO 21524:2021(E)

Note 4 to entry: Within the context of this document, "material" is understood to require the following tests:

Note 5 to entry: a) Room corner test for wall and ceiling linings (ISO/TR 9705-2).

Note 6 to entry: b) Ignitability of products when subjected to direct impingement of flame test (ISO 11925-2).

3.16
means of escape

means whereby a safe route (or routes) in the event of fire is (or are) provided for persons to travel from

any point in a building to a place of ultimate safety
3.17
multi-positional deployment

staged deployment of active fire curtain to provide initial smoke separation prior to full fire separation

3.18
property protection
application of the active fire curtain in its fire-operational c
...

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